Staffers for Sen. Scott Brown were caught on video this week at a rally in Boston chanting Indian "war whoops" and making tomahawk chop gestures, mocking Democratic challenger Elizabeth Warren.

Pictured in the video are Brown's deputy Chief of Staff Greg Casey, his constituent services counsel Jack Richard, and a Republican operative named Brad Garrett, according to Boston's ABC affiliate. According to the Boston Globe, Garrett and Richard are the ones doing the tomahawk chops and chanting; Casey as well as Brown special assistant Jenn Franks and Jerry McDermott, Brown's state director, appear in the video but don't do the same actions.

A spokeswoman for the Brown campaign didn't immediately return a request for comment.

Update: Scott Brown told the Globe that he had not seen the video, but “if you’re saying that, certainly that’s not something I condone. It’s certainly something that, if I’m aware of it, I will tell that [staff] member never to do that again.”

But "the offensiveness here is the fact that professor Warren took advantage of a claim, to be somebody – a Native American -- and using that for an advantage," Brown told the Globe.

Rosie Gray is a reporter for BuzzFeed News and is based in Washington, D.C. Gray reports on politics and foreign policy.